I am still very unexperienced with simulation. I tried to simulate a laminar flow of water in a very small conical nozzle, but I get wall shear stress values equal 0 along the nozzle, and then it suddenly goes up to 3000 Pa at the end (end diameter ~0,2um) - image attached. I suppose the shear stress values should be low at the beginning of the nozzle, but definetely higher than 0. What could be causing that?
Thank you very much in advance.